Osananajimi ga Zettai ni Makenai Love Come S01E05 - The Girl Who Lost Her Memories / The Octopus Wiener Trap

Kuroha's younger sisters suddenly show up into Sueharu's house.  According to them, Kuroha had lost his memory. According to Kuroha, she has no memory of the summer vacation, and his memory stopped on the moment she confessed to Sueharu... Therefore, Kuroha proposes to cancel her actions at the School Festival and start over from the time of her confession. However, Shirokusa is suspicious of Kuroha's behavior...